6639875 has 24 divisors (see below), whose sum is σ = 9129120. Its totient is φ = 4818000.

The previous prime is 6639863. The next prime is 6639881. The reversal of 6639875 is 5789366.

It is not a de Polignac number, because 6639875 - 2¹⁰ = 6638851 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14906 + ... + 15344.

It is an arithmetic number, because the mean of its divisors is an integer number (380380).

Almost surely, 2^6639875 is an apocalyptic number.

6639875 is a deficient number, since it is larger than the sum of its proper divisors (2489245).

6639875 is a wasteful number, since it uses less digits than its factorization.

6639875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 455 counting only the distinct ones).

The product of its digits is 272160, while the sum is 44.

The square root of 6639875 is about 2576.7954905269. The cubic root of 6639875 is about 187.9547480493.

The spelling of 6639875 in words is "six million, six hundred thirty-nine thousand, eight hundred seventy-five".